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DTIC AD0670052: ATMOSPHERIC RADIO NOISE DATA, BANGKOK, THAILAND - DECEMBER 1967-FEBRUARY 1968

by: Defense Technical Information Center

Publication date: 1968-05-01

Topics: DTIC Archive, Chindahporn, Rangsit, STANFORD RESEARCH INST MENLO PARK CA, *IONOSPHERIC PROPAGATION, BANDPASS FILTERS, INTERFERENCE ANALYZERS, NOMOGRAPHS, PERIODIC VARIATIONS, RADIO FIELDS, RADIO INTERFERENCE, RADIOFREQUENCY, SIGNAL TO NOISE RATIO, THAILAND,

Collection: dticarchive; additional_collections

Language: English

Measurements of atmospheric radio noise are being made by the Electronics Laboratory of the Military Research and Development Center (MRDC-EL) , a joint Thailand-United States-organization in Bangkok. The noise-measuring equipment is located near the village of Laem Chabang in order to minimize interference from man-made noise. Four frequencies, either in the MF and HF bands or in the VLF and LF bands, may be recorded simultaneously for 30 minutes. The extent of the variation of the noise power from day to day at a particular hour of the day can be determined from the upper and lower decile values of Fa. Time-block median values of noise are tabulated on a seasonal basis and are obtained by averaging all month-hour medians for the four hours of the day within the three-month period. The results of the noise measurements at MF and HF for the months December 1967, January and February 1968, are also given.